Was literally just on the internet earlier today on ebay and my windows 7 system made a noise that it makes when a usb device has been unplugged. As soon as I heard that one of my two dual display monitors running off the dvi output lost signal. Since then I cannot get the DVI output to work on my Asus p8h77-m on a normal windows boot unless I remove the drivers and use the windows standard vga adapter driver. It works fine in safe mode and before the windows 7 welcome screen then it goes dead as it loads windows. The VGA port works 100% fine all the time.

I don't game on my machine so I would just use the MS Standard VGA drivers but I can't configure my dual display as extended only a clone.

Any ideas why this has happened? Have tried a few different versions of the intel driver from website but all have the same results, have also tried a system restore to a few days ago when it was working and removed any windows updates that happened today but still no joy.

Originally I was using a driver that came with my Asus p8h77-m from cd. Then when I had the incident I was using a driver that was automatically downloaded through windows update service, so to be honest I don't know what version I had. Since the incident I have tried the driver in the link link that you sent (Win&_64_152612) and also two versions I got from the asus website which are apparently V815102618 & V815102669.

Have tried monitor via DVI in another computer now and it works ok but I still have the problem with this machine, no DVI output just before windows welcome screen (shows windows loading and works in safe mode and with standard VGA drivers).